Many iridologists have noticed that the pupil is often mis-shaped. These variations are relative to the spine in particular. This chart offers an explanation of both ellipsoid and flattened pupil sectors. This chart also explains the relevance of pupil size and signs on the pupil border. Concise and easy to use. A3 folding to a convenient A4 size (open 23″ x 16.5″ folds to 11.5″ x 8.25″)